The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 2002
Filed:
Mar. 09, 2000
Applicant:
Inventor:
Günter Schütz, Köln, DE;
Assignee:
Leybold Vakuum GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 2/314 ; F01D 1/36 ;
U.S. Cl.
CPC ...
F04B 2/314 ; F01D 1/36 ;
Abstract
The invention relates to a friction vacuum pump ( ) containing at least one turbomolecular pump stage ( ), a screw pump stage ( ) connected to the delivery side of the pump, and a filling stage ( ) arranged between the turbomolecular pump stage ( ) and the screw pump stage ( ). According to the invention it is proposed that said filling stage ( ) be configured as a centrifugal stage in order to simplify the construction thereof.